* subversion/include/svn_delta.h
  (svn_delta_fetch_props_func_t, svn_delta_fetch_kind_func_t,
   svn_delta_fetch_base_func_t): Fully document these new callback types.
  (struct svn_delta_shim_callbacks_t): Minor docstring tweaks.

git-svn-id: https://svn.apache.org/repos/asf/subversion/trunk@1459478 13f79535-47bb-0310-9956-ffa450edef68